Battery - Yanmar 3JH4E Service Manual

12. Electrical system

12.2 Battery

Refer to 2.2.3(2) for electrolyte level and battery
charge.
Also refer to the service manual of the previous
model 3/4JH3E series for other data regarding
battery.
(1) Battery capacity
Since the battery has a minimum capacity of
12V, 80AH. it can be used for 80-120AH.
Battery capacity
(5 hours rating)
(2) Battery cable
Wiring must be performed with the specified
electric wire. Thick, short wiring should be
used to connect the battery to the starter.
Using wire other than that specified may
cause troubles.
The overall length of the wire between the
battery (+) terminal and the starter (B)
terminal, and between the battery (-) terminal
and the engine earth terminal, should be
determined according to the following table.
Voltage system Allowable wiring voltage drop
12V
Note: Excessive resistance in the key switch circuit (between the battery and start [S] terminals) can
cause improper pinion engagement. To prevent this, follow the wiring diagram carefully.
12V-80AH or more
(type 120D31R equivalent)
0.2V or less/100A
Conductor cross-section area
2
20mm
2
40mm
300
a + b + c
allowable length
Up to 2.5m
Up to 5m